Busy as a bee
形容非常忙碌、勤奋工作，像蜜蜂一样不停劳作。
日常口语，赞美或描述忙碌状态。
英文释义
To be very active and working hard at something
例句
She's been busy as a bee preparing for the conference all week.
典故来源
蜜蜂以勤劳著称，自古就被用来比喻忙碌。